LP Analysis and Quantization Functions

This section describes the GSM-AMR primitives that are concerned with LP analysis, quantization, encoding, and decoding. It also provides details on primitives that accomplish the following tasks:

• Autocorrelation analysis
• Levinson-Durbin algorithm
• LPC to LSP conversion
• LSP to LPC conversion
• LSP quantization and inverse quantization
• Quantized LSP encoding and decoding.

• AutoCorr_GSMAMR
  Estimates the autocorrelation sequence for a block of samples.
• LevinsonDurbin_GSMAMR
  Calculates the LP coefficients using the Levinson-Durbin algorithm.
• LPCToLSP_GSMAMR
  Converts LP coefficients to line spectrum pairs.
• LSPToLPC_GSMAMR
  Converts LSPs to LP coefficients.
• LSFToLSP_GSMAMR
  Converts Line Spectral Frequencies to LSP coefficients.
• LSPQuant_GSMAMR
  Quantizes the LSP coefficient vector.
• QuantLSPDecode_GSMAMR
  Decodes quantized LSPs.

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